ignoring unknown option '-byteswapio'

[francesc_verdaguer1]

I am trying to compile a program prepared to be compiled or work under " pgf77" fortran. In the makefile there is the next sentences:
F77 = pgf77

FLGS = -byteswapio

I changed the first one to "F77 = ifort" because I am using Intel Fortran 9.0, but I have an error (or a warning) with the function -byteswapio:

ifort: Command line warning: ignoring unknown option '-byteswapio'

Could anyone help me and tell me what I have to put in the place of '-byteswapio'?

Thanks for all

[Steven_L_Intel1]

-convert big_endian

[TimP]

Both an environment variable scheme and an OPEN keyword scheme are available to support byte swapping. Please read the documentation which comes with the compiler.

[Steven_L_Intel1]

There are, I think, six different ways of specifying this behavior, through various switches, OPEN keywords and environment variables with varying granularity.